On 13/11/14 15:37, Yingjoe Chen wrote:
> Mediatek SoCs have interrupt polarity support in sysirq which
> allows to invert polarity for given interrupt. Add this support
> using hierarchy irq domain.
>
> Signed-off-by: Yingjoe Chen <yingjoe.c...@mediatek.com>
> ---
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-mtk-sysirq.c | 156
> +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 157 insertions(+)
> create mode 100644 drivers/irqchip/irq-mtk-sysirq.c
>
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 173bb5f..4e0f254 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -38,3 +38,4 @@ obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o
> obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o \
> irq-bcm7120-l2.o
> obj-$(CONFIG_KEYSTONE_IRQ) += irq-keystone.o
> +obj-$(CONFIG_ARCH_MEDIATEK) += irq-mtk-sysirq.o
> diff --git a/drivers/irqchip/irq-mtk-sysirq.c
> b/drivers/irqchip/irq-mtk-sysirq.c
> new file mode 100644
> index 0000000..976b7eb
> --- /dev/null
> +++ b/drivers/irqchip/irq-mtk-sysirq.c
> @@ -0,0 +1,156 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: Joe.C <yingjoe.c...@mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#include "irqchip.h"
> +
> +#define MT6577_SYS_INTPOL_NUM (224)
> +
> +struct mtk_sysirq_chip_data {
> + spinlock_t lock;
> + void __iomem *intpol_base;
> +};
> +
> +static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
> +{
> + irq_hw_number_t hwirq = data->hwirq;
> + struct mtk_sysirq_chip_data *chip_data = data->chip_data;
> + u32 offset, reg_index, value;
> + unsigned long flags;
> + int ret;
> +
> + offset = hwirq & 0x1f;
> + reg_index = hwirq >> 5;
> +
> + spin_lock_irqsave(&chip_data->lock, flags);
> + value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
> + if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
> + if (type == IRQ_TYPE_LEVEL_LOW)
> + type = IRQ_TYPE_LEVEL_HIGH;
> + else
> + type = IRQ_TYPE_EDGE_RISING;
> + value |= (1 << offset);
> + } else
> + value &= ~(1 << offset);
> + writel(value, chip_data->intpol_base + reg_index * 4);
> +
> + data = data->parent_data;
> + ret = data->chip->irq_set_type(data, type);
> + spin_unlock_irqrestore(&chip_data->lock, flags);
> + return ret;
> +}
> +
> +static struct irq_chip mtk_sysirq_chip = {
> + .name = "MT_SYSIRQ",
> + .irq_mask = irq_chip_mask_parent,
> + .irq_unmask = irq_chip_unmask_parent,
> + .irq_eoi = irq_chip_eoi_parent,
> + .irq_set_type = mtk_sysirq_set_type,
> + .irq_retrigger = irq_chip_retrigger_hierarchy,
> + .irq_set_affinity = irq_chip_set_affinity_parent,
> +};
> +
> +static int mtk_sysirq_domain_xlate(struct irq_domain *d,
> + struct device_node *controller,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq,
> + unsigned int *out_type)
> +{
> + if (intsize < 3)
> + return -EINVAL;
> +
> + /* sysirq doesn't support PPI */
> + if (intspec[0])
> + return -EINVAL;
> +
> + *out_hwirq = intspec[1];
> + *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
> + return 0;
> +}
> +
> +static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int
> virq,
> + unsigned int nr_irqs, void *arg)
> +{
> + int i;
> + irq_hw_number_t hwirq;
> + struct of_phandle_args *irq_data = arg;
> +
> + if (irq_data->args_count < 3)
> + return -EINVAL;
> +
> + hwirq = irq_data->args[1];
> + for (i = 0; i < nr_irqs; i++)
> + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
> + &mtk_sysirq_chip,
> + domain->host_data);
> +
> + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
This is exactly why you have this hack in the GIC driver. I'd suggest
the following instead:
{
[...]
struct of_phandle_args *irq_data = arg;
struct of_phandle_args gic_data = *irq_data;
[...]
gic_data.np = domain->parent->of_node;
return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
&gic_data);
}
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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